193688009 has 2 divisors, whose sum is σ = 193688010. Its totient is φ = 193688008.

The previous prime is 193687939. The next prime is 193688029. The reversal of 193688009 is 900886391.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 189667984 + 4020025 = 13772^2 + 2005^2 .

It is a cyclic number.

It is not a de Polignac number, because 193688009 - 2¹² = 193683913 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (193688029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 96844004 + 96844005.

It is an arithmetic number, because the mean of its divisors is an integer number (96844005).

Almost surely, 2^193688009 is an apocalyptic number.

It is an amenable number.

193688009 is a deficient number, since it is larger than the sum of its proper divisors (1).

193688009 is an equidigital number, since it uses as much as digits as its factorization.

193688009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 93312, while the sum is 44.

The square root of 193688009 is about 13917.1839464742. The cubic root of 193688009 is about 578.5855436334.

The spelling of 193688009 in words is "one hundred ninety-three million, six hundred eighty-eight thousand, nine".